Electron tube



Aug. 31, 1943. GA L I 2,328,13

ELECTRON TUBE Filed Feb. 8, 1941 INVENTOR. ALFRED GA EBEL ATTORNEY met A g. 31,

I "2,328,136 I ELECTRON TUBE I AlfredGabbel, Berlin, Germany} yested in the a A qn'lroperty Custodian a v i Application February a 1941; serial N0 311,986 I In January 8, 1940 zciaims; -(ci zsojzms) I The humming noise of electron tubes is caused a bythe electrodes vibrating under the influenceof I shocks and thus entailing current vibrations, In the case of directly heated tubes it is especially tion. 1

"leadslt I I a I I I I.

In the novelarrangement, Fig. 2, the wires 1, 2 I of the fllament are each supported from common 3 leads 5, 5 and are so generally arcuately bent by I' knownjfllament, while FigQ Z is a diagrammatic.

1 sectional view of'an electron tube thatcomprises an example of filaments as providedby the invenmeans of the insulating supports 3, 4" that they 1 intersect and bearagainstone another between these supports. As a sult, longitudina1stretching is avoidedand any vibration of the wires is readily stopped by theirictionai contact-between II them and said supports which are evenly spaced J between' the intersection of said .wires and the I I junction point between leads and the ends or said i Wire. Said supports bowing thewires between their pointof intersection andfth junction point 1 "j thefthin filaments which easily vibrate like 5 of said wireswith the saidileads; a i r stretched chords and thereby produce a continu What is claimed is:" c a i l I 0118 tone, the attenuation at the ends of thef l'a- I 1. An elefctrontubehavingvin conjunction ah; l 'ments'being low. c I filament comprising two wires which intersect In'orde'r to overcome this disadvantage the andbearagainst each other having common sup practice has been, for instance, to support the 10 ports for said wires at each end of said wires, each j i I middle of the filaments by insulating pieces, made support carrying an'end oflboth said wires and:

1 of mica, for example, thus reducing the amplitude having insulating members spacing saidwires at 01' the oscillation and improving attenuation. pointslintermediate thecommon points of supv Accordingto the present invention, the 1 port and'the D Qint of their'intersection, said I I gmentds composed of two wires which are con- 15 spacing members bowsaid wires into generally" I meted ll p l and are ar ng to intersect I arc'uate shape whereby said wires are rigidly sup-i and to bear against ach othennas will be underported without being stretched taut; and further I i I stoodffrom the tollowing description and the ac-f whereby the possibility ofvibrations'beingset up 1 Uconipanyir g drawing, inwhich I onjsai'd wiresis minimized a I a f Fig; 1 isIa diagran matic sectional view of -a '0 2. Ari electron tube having in combination a filament consisting of two wires whichintersect 3 and bear against .each other midway between i j their common:supportyvhichcoinmon support is located at each end of sa id-wires each said support'carrying an end'of both said wires and havi ing insulatedf 'memberst spacing said wires at pointsi intermediate the common points o f support and the point of their intersectiomsaid spacingrnembers bow said wires intoan arcuatcshape, and hold saidwires rigidly without stretchingsaid I I wires taut, said intersectingand bearing-together v of each of said wires in, conjunction with their arcuation and theevenlyspacingof said supports i eliminate the possibility of vibrations being set, up on said wiresand reduce the amplitude of the oscillation of said wires and attenuation of said wires 

